Jamie Oliver has officially revealed his new baby's full name with an adorable Instagram family photo.

The celebrity chef confirmed his newborn son is called River Oliver to Digital Spy on Tuesday (August 23), but it seems he went for something a little more personal when it came to announcing the full name of his fifth child with wife Jools.

"If I'm honest, I go with the flow," he explained. "Not that I'm giving you advice but part of a successful marriage is to go with the flow and shutting up when need be, so we'll see what names she comes up with."